| 1 | /**************************************************************************** |
| 2 | * |
| 3 | * Realmode X86 Emulator Library |
| 4 | * |
| 5 | * Copyright (C) 1996-1999 SciTech Software, Inc. |
| 6 | * Copyright (C) David Mosberger-Tang |
| 7 | * Copyright (C) 1999 Egbert Eich |
| 8 | * |
| 9 | * ======================================================================== |
| 10 | * |
| 11 | * Permission to use, copy, modify, distribute, and sell this software and |
| 12 | * its documentation for any purpose is hereby granted without fee, |
| 13 | * provided that the above copyright notice appear in all copies and that |
| 14 | * both that copyright notice and this permission notice appear in |
| 15 | * supporting documentation, and that the name of the authors not be used |
| 16 | * in advertising or publicity pertaining to distribution of the software |
| 17 | * without specific, written prior permission. The authors makes no |
| 18 | * representations about the suitability of this software for any purpose. |
| 19 | * It is provided "as is" without express or implied warranty. |
| 20 | * |
| 21 | * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| 22 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| 23 | * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| 24 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF |
| 25 | * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR |
| 26 | * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 27 | * PERFORMANCE OF THIS SOFTWARE. |
| 28 | * |
| 29 | * ======================================================================== |
| 30 | * |
| 31 | * Language: ANSI C |
| 32 | * Environment: Any |
| 33 | * Developer: Kendall Bennett |
| 34 | * |
| 35 | * Description: Header file for FPU register definitions. |
| 36 | * |
| 37 | ****************************************************************************/ |
| 38 | |
| 39 | #ifndef __X86EMU_FPU_REGS_H |
| 40 | #define __X86EMU_FPU_REGS_H |
| 41 | |
| 42 | #ifdef X86_FPU_SUPPORT |
| 43 | |
| 44 | #ifdef PACK |
| 45 | #pragma PACK |
| 46 | #endif |
| 47 | |
| 48 | /* Basic 8087 register can hold any of the following values: */ |
| 49 | |
| 50 | union x86_fpu_reg_u { |
| 51 | s8 tenbytes[10]; |
| 52 | double dval; |
| 53 | float fval; |
| 54 | s16 sval; |
| 55 | s32 lval; |
| 56 | }; |
| 57 | |
| 58 | struct x86_fpu_reg { |
| 59 | union x86_fpu_reg_u reg; |
| 60 | char tag; |
| 61 | }; |
| 62 | |
| 63 | /* |
| 64 | * Since we are not going to worry about the problems of aliasing |
| 65 | * registers, every time a register is modified, its result type is |
| 66 | * set in the tag fields for that register. If some operation |
| 67 | * attempts to access the type in a way inconsistent with its current |
| 68 | * storage format, then we flag the operation. If common, we'll |
| 69 | * attempt the conversion. |
| 70 | */ |
| 71 | |
| 72 | #define X86_FPU_VALID 0x80 |
| 73 | #define X86_FPU_REGTYP(r) ((r) & 0x7F) |
| 74 | |
| 75 | #define X86_FPU_WORD 0x0 |
| 76 | #define X86_FPU_SHORT 0x1 |
| 77 | #define X86_FPU_LONG 0x2 |
| 78 | #define X86_FPU_FLOAT 0x3 |
| 79 | #define X86_FPU_DOUBLE 0x4 |
| 80 | #define X86_FPU_LDBL 0x5 |
| 81 | #define X86_FPU_BSD 0x6 |
| 82 | |
| 83 | #define X86_FPU_STKTOP 0 |
| 84 | |
| 85 | struct x86_fpu_registers { |
| 86 | struct x86_fpu_reg x86_fpu_stack[8]; |
| 87 | int x86_fpu_flags; |
| 88 | int x86_fpu_config; /* rounding modes, etc. */ |
| 89 | short x86_fpu_tos, x86_fpu_bos; |
| 90 | }; |
| 91 | |
| 92 | #ifdef END_PACK |
| 93 | #pragma END_PACK |
| 94 | #endif |
| 95 | |
| 96 | /* |
| 97 | * There are two versions of the following macro. |
| 98 | * |
| 99 | * One version is for opcode D9, for which there are more than 32 |
| 100 | * instructions encoded in the second byte of the opcode. |
| 101 | * |
| 102 | * The other version, deals with all the other 7 i87 opcodes, for |
| 103 | * which there are only 32 strings needed to describe the |
| 104 | * instructions. |
| 105 | */ |
| 106 | |
| 107 | #endif /* X86_FPU_SUPPORT */ |
| 108 | |
| 109 | #ifdef DEBUG |
| 110 | #define DECODE_PRINTINSTR32(t,mod,rh,rl) \ |
| 111 | DECODE_PRINTF(t[(mod<<3)+(rh)]); |
| 112 | #define DECODE_PRINTINSTR256(t,mod,rh,rl) \ |
| 113 | DECODE_PRINTF(t[(mod<<6)+(rh<<3)+(rl)]); |
| 114 | #else |
| 115 | #define DECODE_PRINTINSTR32(t,mod,rh,rl) |
| 116 | #define DECODE_PRINTINSTR256(t,mod,rh,rl) |
| 117 | #endif |
| 118 | |
| 119 | #endif /* __X86EMU_FPU_REGS_H */ |